If you prefer to use the Spell-Checker.dll plugin, rather than the DSpellCheck plugin, in the new N++ versions, from the v6.8, you need to install, first, the GNU Aspell orthographic corrector, with all the dictionaries that you want to

So the guideline is :

Download the Windows 32 Aspell executable and run it

Download the English pre-compiled dictionary and run it

Download all the other dictionaries, relative to your preferred languages and run them